Removed unused database helper functions. Reworked database to use size_t and ptrdiff_t types to avoid being bound by indexes types constrains. Print task's times.

1 files changed, 69 insertions, 0 deletions

diff --git a/misc.c b/misc.c
index a192f18..2c734bd 100644
--- a/misc.c
+++ b/misc.c
@@ -1,4 +1,73 @@
 
+// Adds task to database. If necessary, expands database capacity.
+// Returns success.
+bool add_task(database_t* db, const task_t* task) {
+	assert(db != NULL);
+	assert(task != NULL);
+	
+	if (db->count == UINT32_MAX) {
+		fprintf(stderr, "Database reached maximum capacity, discarding task '%s'.\n", task->name);
+		return false;
+	}
+	
+	// If necessary, expand database capacity.
+	uint32_t current_capacity = db->capacity;
+	if((db->count + 1) > current_capacity) {
+		uint32_t new_capacity = current_capacity == 0 ? 2 :
+			current_capacity >= UINT32_MAX >> 2 ? UINT32_MAX :
+			current_capacity << 1;
+		
+		task_t* new_tasks = realloc(db->tasks, new_capacity * SIZEOF_TASK_T);
+		if (new_tasks == NULL) {
+			fprintf(stderr, "Failed to expand database, discarding task '%s'.\n", task->name);
+			return false;
+		}
+		db->capacity = new_capacity;
+		db->tasks = new_tasks;
+	}
+	
+	// Store new task.
+	memcpy(&(db->tasks[db->count]), task, SIZEOF_TASK_T);
+	db->count++;
+	
+	return true;
+}
+
+// TODO Remove this task and move code to delete_task.
+// Removes task by index from database. If possible, shrinks database capacity.
+// Returns success.
+bool remove_task(database_t* db, uint32_t index) {
+	assert(db != NULL);
+	assert(index < db->count);
+	
+	if (index >= db->count) {
+		fprintf(stderr, "Failed to remove out-of-bounds index '%" PRIu32 "'.", index);
+		return false;
+	}
+	
+	// Move tasks after the index position to their new positions.
+	memmove(&db->tasks[index], &db->tasks[index+1], (db->count - index - 1) * SIZEOF_TASK_T);
+	db->count--;
+	
+	// If possible, shrink database capacity.
+	size_t current_capacity = db->capacity;
+	if (db->count <= (current_capacity >> 2)) {
+		ptrdiff_t selected_task_offset = db->tasks - db->active_task;
+		size_t new_capacity = current_capacity >> 1;
+		task_t* new_tasks = realloc(db->tasks, new_capacity * SIZEOF_TASK_T);
+		if (new_tasks == NULL) {
+			fprintf(stderr, "Failed to shrink database.\n");
+			return false;
+		}
+		db->capacity = new_capacity;
+		db->tasks = new_tasks;
+		db->active_task = db->tasks + selected_task_offset;
+		// TODO Validate selected_task (may now be above count.
+	}
+	
+	return true;
+}
+
 uint32_t CRC32(const uint8_t data[], size_t data_length) {
 	
 	static const uint32_t crc32_table[] = {